Flash Gordon
2. The Plague of Sound (1974)
2. War of the Citadels (1980)
3. The Space Circus (1969) (with Con Steffanson (Ron Goulart))
4. The Time Trap of Ming XIII (1974)
4. Fall of Ming (1992)
5. The Witch Queen of Mongo (1936)
5. 1941-1943 'Between Worlds at War' (1992)
6. The War of the Cybernauts (1974)
6. Triumph in Tropica (1993)
The Tournaments of Mongo (1935)
The Caverns of Mongo (1936)
The Ice Kingdom of Mongo (1967)
Into The Water World of Mongo (1971)
The Lion Men of Mongo (1974) (with Con Steffanson (Ron Goulart))
The Underwater World of Mongo (1975)
Escapes to Arboria (1977)
Joins the Power Men (1978)
Flash Gordon on the Lost Continent of Mongo (1980)
The Ice Monster (1980)
Mongo, the Planet of Doom (1990)
Three Against Ming (1991)
The Tides of Battle (1991)